diff --git a/kadai04.js b/kadai04.js
index 2991369..a3a4092 100644
--- a/kadai04.js
+++ b/kadai04.js
@@ -1,10 +1,10 @@
 function CountDown() {
-    var count = 4, tmID, infobox = document.getElementById("start"), fin = document.getElementById("fin"), are = document.querySelectorAll("div");
+    var count = 4, tmID, infobox = document.getElementById("start"), fin = document.getElementById("fin"), are = document.querySelectorAll("div"),clickbutton;
     function countDown() {
 	if (--count == 0) {
 	    infobox.innerHTML = "時間切れ";
 	    //num = Math.floor(Math.ramdom()*10+1);
-	    are.removeEventListener("click", stopCountDown, false);
+	    clickbutton.removeEventListener("click", stopCountDown, false);
 	} else {
 	    fin.innerHTML = count + "秒前";
 	    tmID = setTimeout(countDown, 1000);